Neobux or Grandbux

Hi all. I recently made an account in neobux and started working with it. More or less, I know how the referral system goes. I read a lot about it online and most of the reviews say that it does actually pay, but does not pay much and is not worth the time. Someone suggested that Grandbux is way better. What do you think? Is Neobux worth the effort ? Have you ever been paid by Neobux or other PTC sites? What about Grandbux? Thank you!